Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c5e3006c5cd7c2…

MALICIOUS

PDF

74.6 KB Created: 2021-07-13 07:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 72bf629376b7685cb2b27cdd68da7a93 SHA-1: d03da62e7840f7acb6ae3da080c69388f03c8d70 SHA-256: b5c5e3006c5cd7c2cbbd31b5fceec7d03e25923474e313050c7e389905db38c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to external malicious content, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cffe280a3---kosipujatosefe.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2835d607d---domogekiba.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/fofepaderirinufuxegagi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3a076bd3---7399689646.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/36a934f9f353930bcd639458f0a0fd38/riduvokikutujudagake.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/dtoskkvfei3l8butcm89kmbh5q/70514316819.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/tirezefiw.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082534e247e9---21197559940.pdfIn PDF document text
    • https://artenika.pl/fck/file/lasef.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097504295776---xanowosodufapig.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062219011896.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/96312610208.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde3ec53308---16158499021.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/73978420558.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210522081023706.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/potqbrc4s6j8ujr7m4p8hfkhrc/8167272244.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/igl1rc7hokh5erg1hpjb19do76/56588776086.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20442f47fcbc8b6e3b776bf9a78789f8/62044391857.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/watasosajojafajitiwokuf.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/13/file/20210613_105103_124.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/zejunofuma.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/569f47d98b27baa4e682aa045f6e2e13/59953729893.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/dugorikevivuxapijer.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a656b6b5b98b0731079865247b6afabe/buputujuwadepan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=chronicle+sociology+mains+solved+paper+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 11264 bytes
SHA-256: 7fa9e7e5adfeb4be5c94b43234991325ce555c0ee1469a04231fcccfba5c2f75
font_02_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 16916 bytes
SHA-256: ff68364885ebc8f13e9a15cfc0d1259d74662d2a596361fbf0de0a13d3ba1e66

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